The Old Hrodna Castle (also known as the Hrodna Upper Castle and Bathory's Castle) dates from the 11th century as the seat of a dynasty of Black Ruthenian rulers, descended from a younger son of Yaroslav the Wise of Kiev. The 13th-century keep of the castle belonged to a type of Belarusian defensive tower represented by the Tower of Kamyanyets. Vytautas the Great added five Brick Gothic towers in 1391-98, transforming the castle into one of his main residences. Casimir IV Jagiellon also favoured Hrodna over Lithuania's official capital. It was there that the Polish Crown was offered to him, and it was there that he died in 1495.
The next notable tenant of the castle was Stephen Báthory who envisaged Hrodna as the capital of his vast empire in Eastern Europe. He engaged Scotto of Parma to replace the Vytautas Castle with his own residence in the advanced Renaissance taste of Northern Italy. After Bathory's death in Hrodna in 1586, his pet project was abandoned. The citadel was devastated by the Russians during a Russo-Polish War in 1655.
The castle's revival was owing to Krzysztof Zygmunt Pac who raised sufficient funds to finance the refurbishing of the royal residence. The restored castle was selected by King Michał Korybut Wiśniowiecki of Poland as the location for every third Sejm of the Polish–Lithuanian Commonwealth. The castle suffered extensive damage during the Great Northern War, forcing the royal court to move into the New Hrodna Castle.
After the partitions of Poland the castle was given over to the Russian army and housed a barracks. The authorities of interwar Poland restored the chamber of the ambassadors and the Sejm Hall. In 1925, the former royal palace opened on historical and archaeological museum. At present the castle is located the main exhibition of Grodno Museum of History and Archeology.
References:Visby Cathedral (also known as St. Mary’s Church) is the only survived medieval church in Visby. It was originally built for German merchants and inaugurated in 1225. Around the year 1350 the church was enlarged and converted into a basilica. The two-storey magazine was also added then above the nave as a warehouse for merchants.
Following the Reformation, the church was transformed into a parish church for the town of Visby. All other churches were abandoned. Shortly after the Reformation, in 1572, Gotland was made into its own Diocese, and the church designated its cathedral.
There is not much left of the original interior. The font is made of local red marble in the 13th century. The pulpit was made in Lübeck in 1684. There are 400 graves under the church floor.